Activated charcoal teeth whitening test. Today I’m taking activated charcoal and adding whitening toothpaste. The whitening toothpaste seems to do most the work for the whitening as for the charcoal charcoal works great to clean the teeth. I will say this does work. But not for the reasons that everyone is thinking. Do you drink wine? Do you drink coffee? Are you a smoker? This might be the thing to help you out. I’ve done this test with whitening toothpaste and without whitening toothpaste And the results are very interesting.